heart·beat /ˈhɑrtˌbɪt/ 名詞
n 1: the rhythmic contraction and expansion of the arteries with
each beat of the heart; "he could feel the beat of her
heart" [syn: pulse, pulsation, beat]
2: a very short time (as the time it takes the eye blink or the
heart to beat); "if I had the chance I'd do it in a flash"
[syn: blink of an eye, flash, instant, jiffy, split
second, trice, twinkling, wink, New York minute]
3: an animating or vital unifying force; "New York is the
commercial heartbeat of America"